|Publication number||US7285036 B2|
|Application number||US 11/562,320|
|Publication date||Oct 23, 2007|
|Filing date||Nov 21, 2006|
|Priority date||Feb 17, 2000|
|Also published as||US7029365, US7137868, US20040163946, US20060148381, US20070111638|
|Publication number||11562320, 562320, US 7285036 B2, US 7285036B2, US-B2-7285036, US7285036 B2, US7285036B2|
|Inventors||Shou-sung Chang, Stan D. Tsai, Donald J. K. Olgado, Liang-Yuh Chen, Alain Duboust, Ralph M. Wadensweiler|
|Original Assignee||Applied Materials, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (99), Non-Patent Citations (17), Referenced by (15), Classifications (42), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of U.S. patent application Ser. No. 11/369,065, filed on Mar. 6, 2006, now issued as U.S. Pat. No. 7,137,868, on Nov. 21, 2006 (APPM/004100.C5), which is a continuation of U.S. patent application Ser. No. 10/744,904, filed Dec. 23, 2003 now U.S. Pat. No. 7,029,365, which is a continuation-in-part of U.S. patent application Ser. No. 10/642,128, filed Aug. 15, 2003 now U.S. Pat. No. 6,962,524 (hereinafter the '128 application). The '128 application is a continuation-in-part of U.S. patent application Ser. No. 10/608,513, filed Jun. 26, 2003 (hereinafter referred to as the “513 application”), which is a continuation-in-part of U.S. patent application Ser. No. 10/140,010, filed May 7, 2002 now U.S. Pat. No. 6,979,248. The '513 application is also a continuation-in-part of U.S. patent application Ser. No. 10/211,626, filed Aug. 2, 2002 now U.S. Pat. No. 7,125,447, which is a continuation-in-part of U.S. patent application Ser. No. 10/033,732, filed Dec. 27, 2001 now U.S. Pat. No. 7,066,800, which is a continuation-in-part of U.S. patent application Ser. No. 09/505,899, filed Feb. 17, 2000 now U.S. Pat. No. 6,537,144. The '513 application is additionally a continuation-in-part of U.S. patent application Ser. No. 10/210,972, filed Aug. 2, 2002 now U.S. Pat. No. 7,125,477, which is also a continuation-in-part of U.S. patent application Ser. No. 09/505,899, filed Feb. 17, 2000 now U.S. Pat. No. 6,537,144. The '513 application is further a continuation-in-part of U.S. patent application Ser. No. 10/151,538, filed May 16, 2002 now abandoned. The '128 application is also a continuation-in-part of U.S. patent application Ser. No. 10/244,697, filed Sep. 16, 2002 now U.S. Pat. No. 6,991,526, which is a continuation-in-part of U.S. patent application Ser. No. 10/244,688, filed Sep. 16, 2002 now U.S. Pat. No. 6,848,970, and of U.S. patent application Ser. No. 10/391,324, filed Mar. 18, 2003. All of the above referenced applications are hereby incorporated by reference in their entireties to the extent the applications are not inconsistent with this application.
This application is additionally related to U.S. patent application Ser. No. 10/033,732, filed on Dec. 27, 2001; U.S. patent application Ser. No. 10/455,941, filed Jun. 6, 2003; and U.S. patent application Ser. No. 10,455,895, filed Jun. 6, 2003, all of which are also incorporated herein by reference in their entireties to the extent the applications are not inconsistent with this application.
1. Field of the Invention
Embodiments of the present invention generally relate to a pad assembly for electrochemical mechanical processing.
2. Description of the Related Art
Electrochemical Mechanical Processing (ECMP) is a technique used to remove conductive materials from a substrate surface by electrochemical dissolution while concurrently polishing the substrate with reduced mechanical abrasion as compared to conventional Chemical Mechanical Polishing (CMP) processes. ECMP systems may generally be adapted for deposition of conductive material on the substrate by reversing the polarity of the bias. Electrochemical dissolution is performed by applying a bias between a cathode and a substrate surface to remove conductive materials from the substrate surface into a surrounding electrolyte. The bias may be applied to the substrate surface by a conductive contact disposed on or through a polishing material upon which the substrate is processed. A mechanical component of the polishing process is performed by providing relative motion between the substrate and the polishing material that enhances the removal of the conductive material from the substrate.
Copper is one material that may be polished using electrochemical mechanical polishing. Typically, copper is polished utilizing a two-step process. In the first step, the bulk of the copper is removed, typically leaving some copper residue on the substrate's surface. The copper residue is then removed in a second, or over-polishing, step.
During electrochemical processing, the copper layer disposed on the substrate is pressed against a polishing surface and is biased relative to an electrode. An electrolyte fluid is disposed between the copper layer and the electrode. The electrolyte completes an electrical circuit between the substrate and the electrode, which assists in the removal of material from the surface of the substrate. As the polishing surface and electrode are consumed during processing a number of substrates, periodic replacement of both the polishing surface and electrode is required, thus necessitating interruption of substrate processing. Therefore, it is desirable to configure the polishing surface, electrode and polishing system in general in a configuration that facilitates quick and efficient replacement of the polishing surface and electrode to minimize process interruptions.
Thus, there is a need for an improved apparatus for electrochemical mechanical processing.
In one embodiment, a pad assembly for processing a substrate is described. The pad assembly includes a processing layer made of a conductive material having a working surface to contact the substrate, a compressible layer coupled to and disposed below the processing layer, and an electrode disposed above the compressible layer and below the working surface of the processing layer, wherein an upper surface of the electrode is at least partially exposed to the processing layer by a plurality of holes formed in the processing layer and the compressible layer.
In another embodiment, a pad assembly for processing a substrate is described. The pad assembly includes a conductive processing layer having a grooved working surface to contact the substrate, a compressible layer coupled to and disposed below the processing layer, and an electrode disposed above the compressible layer and below the working surface of the processing layer, wherein an upper surface of the electrode is at least partially exposed to the processing layer by a plurality of holes formed in the processing layer and the compressible layer, and wherein the plurality of holes comprises at least two groups of holes formed in a concentric pattern.
In another embodiment, a pad assembly for processing a substrate is described. The pad assembly includes a processing layer made of a conductive material having a working surface to contact the substrate, the working surface having at least one groove formed therein, a compressible layer coupled to and disposed below the processing layer, and an electrode disposed above the compressible layer and below the working surface of the processing layer, wherein an upper surface of the electrode is at least partially exposed to the processing layer by a plurality of holes formed in the processing layer and the compressible layer, and wherein the plurality of holes include at least two concentric groupings of holes each defining an open area of between about 10 percent to about 90 percent of the working surface, wherein at least two of the at least two groupings of holes have different size open areas.
So that the manner in which the above recited features, advantages and objects of the present invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures.
A processing pad assembly adapted to enhance uniform deposition/removal of material to/from a substrate is provided herein. The processing pad assembly is additionally configured to facilitate efficient removal and replacement, thereby improving system processing capacity. The processing pad assembly includes at least a processing pad having a working surface and an electrode. The processing pad is at least partially permeable to electrolyte and is adapted to allow biasing of a feature side of a substrate during processing. Although the embodiments disclosed below focus primarily on polishing a substrate, it is contemplated that the teachings disclosed herein may be used to electroplate a substrate by reversing the polarity of the bias.
In one embodiment, the carrier head assembly 118 is supported by an arm 164 coupled to a column 130 and which extends over the platen assembly 142. The carrier head assembly 118 generally includes a drive system 102 coupled to a carrier head 122. The drive system 102 generally provides at least rotational motion to the carrier head 122. The carrier head 122 additionally may be actuated toward the platen assembly 142 such that the substrate 120 retained in the carrier head 122 may be disposed against a processing surface 126 of the platen assembly 142 during processing.
In one embodiment, the carrier head 122 may be a TITAN HEAD™ or TITAN PROFILER™ wafer carrier manufactured by Applied Materials, Inc., of Santa Clara, Calif. Generally, the carrier head 122 comprises a housing 124 and retaining ring 126 that define a center recess in which the substrate 120 is retained. The retaining ring 126 circumscribes the substrate 120 disposed within the carrier head 122, while leaving the feature side 112 exposed, to prevent the substrate from slipping out from under the carrier head 122 during processing. It is contemplated that other polishing heads may be utilized.
The platen assembly 142 is rotationally disposed on a base 158. A bearing 154 is disposed between the platen assembly 142 and the base 158 to facilitate rotation of the platen assembly 142 relative to the base 158. A motor 160 is coupled to the platen assembly 142 to provide rotational motion.
In one embodiment, the platen assembly 142 includes an upper plate 114 and a lower plate 148. The upper plate 114 may be fabricated from a rigid material, such as a metal or rigid plastic, and in one embodiment, is fabricated from or coated with a dielectric material, such as chlorinated polyvinyl chloride (CPVC). The upper plate 114 may have a circular, rectangular or other geometric form with a substantially planar top surface 116. The top surface 116 of the upper plate 114 supports the pad assembly 106 thereon. The pad assembly 106 may be held to the top surface 116 of the upper plate 114 by magnetic attraction, electrostatic attraction, vacuum, adhesives, or the like.
The lower plate 148 is generally fabricated from a rigid material, such as aluminum and may be coupled to the upper plate 114 by any conventional means, such as a plurality of fasteners (not shown). Generally, a plurality of locating pins 146 (one is shown in
A plenum 138 is defined in the platen assembly 142 and may be partially formed in at least one of the upper or lower plates 114, 148. In the embodiment depicted in
The pad assembly 106 includes at least a processing layer 104 and an electrode 110. The processing layer 104 has a working surface 128 that, in one embodiment, is adapted to polish the feature side 112 of the substrate 120 during processing. The working surface 128 may be smooth or patterned to facilitate distribution of a polishing fluid or electrolyte over the surface of the pad assembly 106. Patterns may include grooves, cutouts, perforations, and the like. The processing layer 104 may be fabricated from polymeric materials compatible with the process chemistry, examples of which include polyurethane, polycarbonate, fluoropolymers, PTFE, PTFA, polyphenylene sulfide (PPS), or combinations thereof, and other polishing materials used in polishing substrate surfaces. In one embodiment, the working surface 128 of the processing layer 104 is dielectric, for example, polyurethane or other polymer.
In another embodiment, the working surface 128 of the processing layer 104 may include conductive material or include conductive contact elements extending therefrom. For example, the working surface 128 may be fabricated from a conductive composite (i.e., the conductive elements are dispersed integrally with or comprise the material comprising the polishing surface), such as a polymer matrix having conductive particles dispersed therein or a conductive coated fabric, among others. Examples of processing layers that may be adapted to benefit from the invention are described in U.S. Pat. No. 6,991,528, filed Jun. 6, 2003 and issued on Jan. 31, 2006, and U.S. Patent Publication No. 2004-0020789, filed Jun. 6, 2003 by Y. Hu et al. (entitled “CONDUCTIVE POLISHING ARTICLE FOR ELECTROCHEMICAL MECHANICAL POLISHING”), both of which are hereby incorporated by reference in their entireties to the extent the applications are not inconsistent with this application.
The electrode 110 is generally positioned between the working surface 128 of the processing layer 104 and the top surface 116 of the platen assembly 142. The electrode 110 can be a plate-like member or laminate, a plate having multiple apertures formed therethrough, or a plurality of electrode pieces disposed in a permeable membrane or container. For example, the electrode 110 may be a metal foil, a mesh made of metal wire or metal-coated wire, or a laminated metal layer on a polymer film compatible with the electrolyte, such as a polyimide, polyester, flouroethylene, polypropylene, or polyethylene sheet. The electrode 110 may act as a single electrode, or may comprise multiple independent electrode zones isolated from each other. Zoned electrodes are discussed in U.S. patent application Ser. No. 10/642,128, filed Aug. 15, 2003, which is hereby incorporated by reference in its entirety.
The electrode 110 is fabricated of a material compatible with electrolyte chemistries and generally has a low bulk conductivity. The stiffness of the electrode 110 should be low enough to ensure the processing layer 104 conforms to the substrate 120 and retains a generally flat profile (i.e., does not have a “potato chip” form).
The electrode 110 is typically comprised of a corrosion resistant conductive material, such as metals, conductive alloys, metal coated fabrics, conductive polymers, conductive pads, and the like. Conductive metals include Sn, Ni, Cu, Au, and the like. Conductive metals also include a corrosion resistant metal such as Sn, Ni, or Au coated over an active metal such as Cu, Zn, Al, and the like. Conductive alloys include inorganic alloys and metal alloys such as bronze, brass, stainless steel, or palladium-tin alloys, among others. Metal coated fabric may be woven or non-woven with any corrosion resistant metal coating. Conductive pads consist of conductive fillers disposed in a polymer matrix.
When metal is used as material for the electrode 110, it may be a solid sheet. Alternatively, the electrode 110 may be perforated or formed of a metal screen in order to increase surface area, which increases the substrate removal rate during processing.
The pad assembly 106 is at least partially permeable to electrolyte at least between the electrode 110 and the working surface 128 of the processing layer 104. The pad assembly 106 is adapted to electrically bias the substrate 120 during processing by electrically coupling the substrate 120 to one terminal of the power source 166. The electrode 110 of the pad assembly 106 is coupled to another terminal of the power source 166. The electrolyte, which is introduced from the electrolyte source 170 and is disposed on the pad assembly 106, completes an electrical circuit between the substrate 120 and the electrode 110 of the pad assembly 106, which, in one embodiment, assists in the removal of material from the surface of the substrate 120.
The electrode 110, subpad 212, and processing layer 104 of the pad assembly 106 may be combined into a unitary assembly by the use of adhesives, bonding, compression molding, or the like. In one embodiment, adhesive is used to attach the electrode 110, subpad 212, and processing layer 104 together. The adhesive generally is a pressure sensitive adhesive or a temperature sensitive adhesive and should be compatible with the process chemistry as well as with the different materials used for the electrode 110, subpad 212, and/or processing layer 104. The adhesive may have a strong physical and/or chemical bond to the electrode 110, subpad 212, and processing layer 104. However, selection of the adhesive may also depend upon the form of the electrode 110, subpad 212, and processing layer 104. The adhesive bonding between the electrode 110, subpad 212, and processing layer 104 may be increased by the surface morphology of the materials selected to form the pad assembly 106 (i.e., fabrics, screens, and perforations versus solids). For example, if the electrode 110 is fabricated from a screen, mesh, or perforated foil, a weaker adhesive may be selected due to the increased surface area of the electrode 110.
The pad assembly 106 is disposed on the top surface 116 of the upper plate 114 of the platen assembly 142 and may be held there by magnetic attraction, static attraction, vacuum, adhesives, or the like. In one embodiment, adhesive is used to adhere the subpad 212 of the pad assembly 106 to the upper plate 114.
In one embodiment, at least one permeable passage 218 is disposed through the processing layer 104 and extends at least to the electrode 110. The passage 218 allows an electrolyte to establish a conductive path through the processing layer 104 between the substrate 120 and the electrode 110. The passage 218 may be a permeable portion of the processing layer 104, holes formed in the processing layer 104, or a combination of the two. In the embodiment depicted in
Although the pattern of the holes 216 should be uniform, the holes 216 may be grouped into different regions, or zones, of varying open area percentage with a uniform pattern within each respective zone. For example,
It should be noted that although the holes depicted in
The plurality of holes 216 may be molded in the processing layer 104 as formed, or the holes 216 may be formed by, for example, a steel rule die, an ultrasonic knife/punch, or a male/female die punch, among other forming methods. Care should be taken in perforating the processing layer 104 as any irregularities in the working surface 128 of the processing layer 104 may cause damage to the substrate 120. The location and open area percentage of the holes 216 in the processing layer 104 controls the quantity and distribution of electrolyte contacting the electrode 110 and substrate 120 during processing, thereby controlling the rate of removal of material from the surface of the substrate 120 in a polishing operation, or the rate of deposition in a plating operation.
Optionally, an extension 222 of the permeable passage 218 may be formed in and at least partially through the electrode 110 (shown in phantom) in order to increase the surface area of the electrode 110 in contact with the electrolyte. The extension 222 may extend completely through the electrode 110. The larger surface area of electrolyte contact with the electrode 110 improves the rate of removal of material from the surface of the substrate 120 during polishing and the rate of deposition during plating.
The subpad 212 is typically made of a material softer, or more compliant, than the material of the processing layer 104. The difference in hardness or durometer between the processing layer 104 and the subpad 212 may be chosen to produce a desired polishing/plating performance. The subpad 212 may also be compressible. Examples of suitable subpad 212 materials include, but are not limited to, open or closed-cell foamed polymer, elastomers, felt, impregnated felt, plastics, and like materials compatible with the processing chemistries.
At least one aperture 240 is formed through the pad assembly 106. Each of the at least one aperture 240 is of a size and location to accommodate a contact element 234 passing therethrough. In the embodiment depicted in
In the embodiment depicted in
The permeable passages 418 allow electrolyte to contact the electrode 410 and the substrate 120 during processing. In the embodiment depicted in
The embodiments of processing pad assemblies discussed above are general depictions of the configuration of the processing layer and the electrode and any other necessary components, as noted. It is contemplated that other layers may be added and/or configurations may be construed using the principles discussed above. For example, release layers and liners may be added to accommodate the attachment and detachment of the polishing pad assemblies from the platen assembly.
While the foregoing is directed to the illustrative embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
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|U.S. Classification||451/5, 204/224.00M, 451/533, 205/672|
|International Classification||B24D13/14, C25D17/10, B24B37/04, B23H5/06, B23H5/00, B23H5/10, B23H5/08, B24B49/16, B24B53/007, H01L21/321, B24D11/02, C25F3/00, C25C7/04, C25D17/00|
|Cooperative Classification||B24B37/26, B23H5/06, B24B37/22, B24B53/017, B24B37/24, H01L21/32125, C25D17/10, B24B37/046, B24B49/16, B23H5/08, B23H5/10, B24B37/11|
|European Classification||B24B37/26, B24B37/24, C25D17/10, B23H5/10, B24B37/22, B24B37/11, B24B49/16, B24B53/017, H01L21/321P2B, B23H5/06, B24B37/04D, B23H5/08|
|Nov 21, 2006||AS||Assignment|
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Owner name: APPLIED MATERIALS, INC.,CALIFORNIA
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